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demo.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">
<style>
* {
padding: 0;
margin: 0;
}
html, body {
height: 100%;
}
body {
overflow: hidden;
}
.pages {
height: 100%;
}
.page {
position: relative;
height: 100%;
overflow: hidden;
}
.pages .page:nth-child(1) {
background: red;
}
.pages .page:nth-child(2) {
background: green;
}
.pages .page:nth-child(3) {
background: blue;
}
</style>
</head>
<body>
<div class="pages">
<div class="page active"></div>
<div class="page"></div>
<div class="page"></div>
</div>
<script>
function $(selector, parentNode) {
parentNode = parentNode || document;
return parentNode.querySelector(selector);
}
function $$(selector, parentNode) {
parentNode = parentNode || document;
return parentNode.querySelectorAll(selector);
}
function pageScroll(options) {
var opts = {
container : $(options.container),
direction : options.direction || 'vertical',
effect : options.effect || '',
start : options.start || function(){},
end : options.end || function(){},
scrollDuration : 300,
springbackDuration: 200
};
var touch = null;
var child = opts.container.children;
var maxIndex = child.length - 1;
var onceDistance = opts.direction === 'vertical' ? document.documentElement.clientHeight: document.documentElement.clientWidth;
var current = {
index: 0,
position: 0
};
var evts = {
'touchstart': function (e) {
e.preventDefault();
e.stopPropagation();
//touch被销毁或第一次触摸才响应，否则页面还在动画中不响应
if (!touch) {
initTouch(e);
opts.start.call(child[current.index], current.index);
}
},
'touchmove': function (e) {
e.preventDefault();
e.stopPropagation();
if (touch) {
touch.distance = e.touches[0].pageY - touch.startY;
touch.direction = touch.distance < 0 ? 'forward' : 'backward';
if (touch.direction === 'backward' && current.index === 0 || touch.direction === 'forward' && current.index === maxIndex) {
initTouch(e);
} else {
setCssText(touch.distance + current.position);
}
}
},
'touchend': function (e) {
e.preventDefault();
e.stopPropagation();
if (touch && touch.distance) {
touch.costTime = Date.now() - touch.startTime;
upliftHandler();
}
touch = null;
}
};
//防止在滑动过程中失去焦点导致停止
evts.touchcancel = evts.touchend;
bindEvents(evts);
//初始化touch信息
function initTouch(e) {
touch = {
distance: 0,
startX: e.touches[0].pageX,
startY: e.touches[0].pageY,
startTime: Date.now()
};
}
//滑动后抬起的处理
function upliftHandler() {
if (Math.abs(touch.distance) > onceDistance/6) {
scroll();
} else {
springback();
}
}
//翻页
function scroll() {
var oldIndex = current.index;
if (touch.direction === 'forward') {
current.index += 1;
} else {
current.index -= 1;
}
current.position = -current.index * onceDistance;
setCssText(current.position, opts.scrollDuration);
setTimeout(function () {
opts.end.apply(child[current.index], [current.index, oldIndex, child[oldIndex]]);
}, opts.scrollDuration);
}
//不满足翻页条件页面回弹
function springback() {
setCssText(current.position, opts.springbackDuration);
}
function setCssText(position, duration) {
var prefix = ['webkit', 'moz', 'o', 'ms'];
var cssText = [];
var addText = function (text) {
for (var i = 0, len = prefix.length; i < len; i++) {
cssText.push('-' + prefix[i] + '-' + text);
}
cssText.push(text);
};
if (opts.direction === 'vertical') {
addText('transform:translate3d(0,' + position +'px,0)');
} else {
addText('transform:translate3d(' + position +'px,0,0)');
}
duration && addText('transition:' + ['transform', opts.effect, duration + 'ms'].join(' '));
opts.container.style.cssText = cssText.join(';');
}
function bindEvents(events) {
//TODO:safari出现滚动条
$('html').addEventListener('touchstart', function(){});
//页面调整自适应
window.addEventListener('resize', function () {
onceDistance = opts.direction === 'vertical' ? document.documentElement.clientHeight: document.documentElement.clientWidth;
current.position = -current.index * onceDistance;
setCssText(current.position);
});
for (var name in events) {
if (events.hasOwnProperty(name)) {
opts.container.addEventListener(name, events[name], false);
}
}
}
}
pageScroll({
container: '.pages',
direction: 'vertical',
effect: 'ease',
start: function (index) {
console.log('start', this, index);
},
end: function (index, prevIndex, prevPage) {
console.log('end', this, index, prevIndex, prevPage);
this.classList.add('active');
prevPage.classList.remove('active');
}
});
</script>
</body>
</html>